Thermo-catalytic decomposition of formaldehyde: a novel approach to produce mesoporous ZnO for enhanced photocatalytic activities
Thermo-catalytic decomposition of formaldehyde: a novel approach to produce mesoporous ZnO for enhanced photocatalytic activities
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甲醛的热催化分解：一种生产介孔ZnO以增强光催化活性的新方法
DOI：
10.1088/0957-4484/25/25/255701
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发表时间：
2014-06-27
期刊：
影响因子：
3.5
通讯作者：
Zhao, Ling Z.
中科院分区：
文献类型：
--
作者：
Lei, Jian F.;Li, Li B.;Zhao, Ling Z.
采用热催化分解甲醛的新方法合成了具有较高光催化活性的介孔氧化锌晶体。通过在不同体系中合成一系列样品，并用FT-IR、EDS、X射线衍射仪、扫描电子显微镜和透射电子显微镜对其进行表征，探讨了介孔形成的机理。结果表明，甲醛在晶体生长过程中吸附在氧化锌晶面上，然后在烧结过程中被催化分解为CO、CO2和H2。由于这些气体的形成和逸出，这些气体充当模板，迫使氧化锌晶体颗粒一致地重新排列，并在内部晶体中形成气孔。此外，还通过相同的方法获得了多孔性的二氧化钛晶体。光催化实验表明，多孔氧化锌晶体的光催化活性高于非多孔氧化锌晶体。
A novel method, thermo-catalytic decomposition of formaldehyde, is used to synthesize mesoporous ZnO crystals with enhanced photocatalytic activities. The mechanism of the mesoporous formation is investigated by synthesizing a series of samples at various systems and characterizing them with FT-IR, EDS, XRD, SEM, and TEM. The results show that formaldehyde can be adsorbed on the crystal planes of ZnO during the crystal growth and can then be catalytically decomposed into CO, CO2 and H2 during a sintering process. Because of the formation and the escape of these gases, which act as templates, the crystalline particles of ZnO are forced to rearrange consistently, and pores are formed in the internal crystal. Also, porous TiO2 crystals have been obtained via the same approach. Photocatalytic tests indicate that a porous ZnO crystal has higher activity than that of a nonporous one.